They said King accepted football tickets, bowl tickets and a Sugar Bowl ring from the University of Arkansas football program.
In the public letter, the ethics commission advised King not to engage in the same activity again. A letter of caution is one of the commission's mildest sanctions, according to its rules of practice and procedure
The commission also can issue letters of warning and reprimand and can levy fines between $50 and $2,000.
Click the PDF below to read the full letter.